Shopping cart having plastic basket

ABSTRACT

A shopping cart comprises a wheeled chassis, a handle structure including two handle uprights, and a plastic basket comprising separate side, front, and bottom panel members molded from a suitable plastic and assembled without any need for an interior frame. The side and front panel members have tabs. The front and bottom panel members have slots. The tabs are received by the slots to assemble the panel members. A rim wire has side portions received by wire-receiving formations of near top edge portions of the side panel members and a bight portion bearing against a top edge portion of the front panel member. The side portions are bent to form prongs inserted into apertures in the handle uprights to position the basket before the basket is fastened to the handle uprights and to the wheeled chassis.

TECHNICAL FIELD OF THE INVENTION

This invention pertains to a shopping cart comprising a wheeled chassis,a handle structure, and a plastic basket of an improved construction.The plastic basket comprises separate side, front, and bottom panelmembers molded from a suitable plastic and assembled without any needfor an interior frame.

BACKGROUND OF THE INVENTION

A shopping cart of a type in widespread use in supermarkets, drugstores, hardware stores, and other retail establishments comprises awheeled chassis, a handle structure, and a basket. Commonly, the baskethas fixed side, front, and bottom panel members and a pivotable back,which can be upwardly pivoted to permit one cart to nest within another.Although it is common for the basket to be wholly or predominantly madefrom welded wire components, it is known for the basket to have moldedplastic panel members, which are preferred by some retailers.

As exemplified in Rehrig U.S. Pat. No. 3,999,774, it is known for aplastic basket for a shopping cart of the type noted above to comprise asingle, molded part defining two side panel members, a front panelmember, and a bottom panel member. A multipanel part can be quiteexpensive to mold. It can be quite difficult to maintain dimensionaltolerances when molding such a part.

Joseph U.S. Pat. No. 4,123,077 discloses, in a shopping cart of the sametype, a basket comprising an interior framework and plastic side, front,and bottom panel members, which may be separately molded, and which areattached to the interior framework. The use of an interior frameworkadds to the complexity and overall manufacturing cost of the shoppingcart.

It would be highly desirable to construct a basket for a shopping cartof the type noted above from plastic side, front, and bottom panelmembers that could be separately molded and that could be easilyassembled without any need for an interior framework for the basket.

SUMMARY OF THE INVENTION

According to a first aspect of this invention, a shopping cart comprisesa wheeled chassis, a handle structure, and a basket of an improvedconstruction. The basket is fastened to the wheeled chassis and to thehandle structure. The basket comprises separate panel members moldedfrom a plastic material and including two side panel members, a frontpanel member, and a bottom panel member. One or more of the side, front,and bottom panel members have tabs thereon. One or more of the samepanel members have slots therein. The tabs are received by the slots toassemble the panel members having the tabs and the panel members havingthe slots.

Preferably, the tabs include tabs on side edges of the front panelmember and tabs on bottom edges of the side panel members, and the slotsinclude slots in the bottom panel member receiving the tabs on thebottom edges of the side panel members and slots in the front edges ofthe side panel members receiving the tabs on side edges of the frontpanel member. Preferably, the tabs also include tabs on a bottom edge ofthe front panel member, and the slots also include slots in the bottompanel member receiving the tabs on the bottom edge of the front panelmember. Accordingly, the tabs are received by the slots to assemble theside, front, and bottom panel members.

In a preferred construction, each side panel member has a top edgeportion having a wire-receiving formation extending therealong, and thebasket further comprises a rim wire. The rim wire has two side portionsand a bight portion connecting the side portions. The side portions arereceived by the wire-receiving formations. The bight portion bearsagainst a top edge portion of the front panel member.

Preferably, the wire-receiving formations comprise outwardly openingchannels and inwardly opening channels. The inwardly opening channelsalternate with the outwardly opening channels along the top edgeportions of the side panel members.

According to a second aspect of this invention, a shopping cartcomprises a wheeled chassis, a handle structure including two handleuprights extending from the wheeled chassis, and a basket of a similaror different construction. The basket comprises molded plastic panelmembers including two side panel members, a front panel member, and abottom panel member, which may be separate panel members, as describedabove. Two prongs extend backwardly from the top side panel members intoapertures in the handle uprights for positioning the basket relative tothe handle uprights prior to fastening the basket to the wheeled chassisor to the handle uprights. Rivets, screws, or other fasteners areprovided for fastening the basket to the wheeled chassis and to thehandle uprights.

Advantageously, if the rim wire described above is used, the sideportions of the rim wire may extend backwardly from back edges of theside panel members to define the prongs. Preferably, where they extendbackwardly therefrom, the side portions of the rim wire are bent todefine the prongs.

These and other objects, features, and advantages of this invention areevident from the following description of a preferred embodiment of thisinvention with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a shopping cart having a plastic basketand constituting a preferred embodiment of this invention.

FIG. 2 is a sectional view taken along line 2--2 of FIG. 1, in adirection indicated by arrows.

FIG. 3 is an exploded, perspective view of the shopping cart.

FIG. 4, on a somewhat larger scale, is a side elevation of a side panelmember of the plastic basket, apart from the chassis and handlestructure of the shopping cart.

FIG. 5 is a fragmentary, exploded, perspective view of a portion of theside panel member, along with an outer, removable frame attachablethereto.

FIG. 6, on a slightly larger scale, is a sectional view taken along line6--6 of FIG. 5, in a direction indicated by arrows, with portions of theouter frame attached thereto and shown in phantom lines.

FIG. 7 is a top elevation of a bottom panel member of the plasticbasket, apart from the chassis and handle structure noted above.

FIG. 8 is a bottom elevation of the bottom panel member, apart from thechassis and handle structure noted above.

FIG. 9 is a front elevation of a front panel member of the plasticbasket, apart from the chassis and handle structure.

FIG. 10 is a sectional view taken along line 10--10 of FIG. 9, in adirection indicated by arrows.

FIG. 11 is a side elevation of the front panel member, as taken from theleft side of FIG. 9.

FIG. 12 is an fragmentary, exploded, perspective view of a lower panelmember of the plastic basket and a wheeled chassis of the shopping cartin one stage in the assembly of the shopping cart.

FIG. 13 is a perspective view of a front panel member of the plasticbasket and a rim wire in one stage in the assembly of the shopping cart.

FIG. 14 is a fragmentary, exploded, perspective view of the front panelmember, the rim wire, and two retaining clips in a later stage in theassembly of the shopping cart.

FIG. 15 is a perspective view of the same components and two side panelmembers of the plastic basket in a later stage in their assembly.

FIG. 16 is a fragmentary, sectional detail taken along line 16--16 ofFIG. 15, in a direction indicated by arrows.

FIG. 17 is a fragmentary, sectional detail taken along line 17--17 ofFIG. 15, in a direction indicated by arrows.

FIG. 18 is a fragmentary, perspective view of the plastic basket and thewheeled chassis in a yet later stage in the assembly of the shoppingcart.

FIG. 19 is a fragmentary, sectional detail taken along line 19--19 ofFIG. 18, in a direction indicated by arrows.

FIG. 20 is a fragmentary, perspective view of the plastic basket and thewheeled chassis in a still later stage in the assembly of the shoppingcart.

FIG. 21 is a fragmentary, sectional detail taken along line 21--21 ofFIG. 20, in a direction indicated by arrows.

FIG. 22 is an elevational view showing a handle structure being attachedin a later stage in the assembly of the shopping cart.

FIG. 23 is a simplified, fragmentary view showing a pivotable lock beingmounted to the handle structure, in a final stage in the assembly of theshopping cart.

FIG. 24 is an enlarged, exploded detail taken from FIG. 23.

FIG. 25 is a perspective view similar to FIG. 1 but showing amodification of the front panel member of the plastic basket, inalternate embodiment of this invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

As shown in FIG. 1 and other views, a shopping cart 10 comprising awheeled chassis 12, a handle structure 14, a pivotable back 16, and abasket 18 of an improved construction constitutes a preferred embodimentof this invention. The basket 18 comprises separate side, front, andbottom panel members molded from a suitable plastic and assembledwithout any need for a basket frame.

The wheeled chassis 12 is similar to wheeled chassis used on shoppingcarts known heretofore, such as Model 85 Shopping Carts made and sold byUnarco Commercial Products of Oklahoma City, Okla.

The wheeled chassis 12 comprises a main frame 20 made from steel tubingbent so as to form two side portions 22 extending longitudinally at aslight angle relative to each other, a front portion 24 extendingtransversely from and connecting the side portions 22, two back portions26, each extending upwardly and forwardly from one of the side portions22 at an acute angle relative to the same side portion 22, and anintermediate portion 28 (see FIG. 3) extending transversely between theside portions 22. The intermediate portion 28 comprises welded ends ofthe steel tubing of the main frame 20 about midway between the sideportions 22.

The wheeled chassis 12 also comprises an intermediate brace 30 made fromsteel tubing bent so as to form two side portions 32, each being weldedto one of the side portions 22 of the main frame 20 at a lower,saddle-shaped end 34, and an upper, transverse portion 36 connecting theside portions 32 and extending transversely beneath the transverseportion 28 of the main frame 20. The transverse portion 36 of theintermediate brace 30 is disposed beneath the transverse portion 28 ofthe main frame 20 and is welded to such portion 28. Moreover, thewheeled chassis 12 comprises a welded wire shelf 38 mounted to the mainframe 20, between the side portions 22. Four casters 40 are mountedbeneath the side portions 22 in a known manner.

As shown in FIG. 3, the handle structure 14 is made from steel tubingbent to form two upright portions 50 and a transverse portion 52connecting the upright portions 50 at their upper ends. As shown inFIGS. 1 and 2, each of the upright portions is riveted to one of theback portions 26 of the main frame 20 of the wheeled chassis 12, at alower, saddle-shaped end 54. A plastic grip 56, which may bearadvertising or other indicia, is mounted on the transverse portion 54 ina known manner. The plastic grip 56 is omitted in FIGS. 3, 23, and 24 soas to show the transverse portion 52. The upright portions 50 may beconveniently referred to as the handle uprights 50.

The pivotable back 16 is similar to the pivotable backs used on shoppingcarts known heretofore, such as Model 85 Shopping Carts made and sold byUnarco Commercial Products of Oklahoma City, Okla. At its upper edge, oneach side, the pivotable back 16 is mounted pivotally to the handleuprights 50 so as to be upwardly pivotable when a similar cart (notshown) is nested with the shopping cart 10. The pivotable back 16 ismanipulatable either to provide a baby seat 58, as shown in FIG. 2, orto fold backwardly so as to be substantially coplanar with the handleuprights 50. Further structural and functional details of the pivotableback 16 are outside the scope of this invention and can be readilysupplied by persons having ordinary skill in the art.

The plastic basket 18 is riveted to the handle uprights 50 and to thetransverse portion 28 of the main frame 20 of the wheeled chassis 12 ina manner to be later described. The plastic basket 18 comprises two sidepanel members 70, a front panel member 72, and a bottom panel member 74,each being molded from a suitable plastic. The side and front panelmembers have extensive patterns of hexagonal holes 76. The bottom panelmember 74 has extensive patterns of square holes 78. These patterns ofholes reduce the overall weight of the panel members and permit visualaccess to the basket interior. Although hexagonal holes are preferredfor the side and front panel members, square, diamond-shaped, ordifferently shaped holes may be alternatively used. A preferred materialfor molding the panel members is high density polyethylene. Analternative material therefor is polyurethane.

As shown in FIG. 4, each side panel member 70 is generally quadrilateralwith a front edge 80 extending vertically, a bottom edge 82 extendingbackwardly and downwardly from the front edge 80 at a slight anglerelative to the horizontal, a top edge 84 extending backwardly andupwardly from the front edge 80 at a slight angle relative to thehorizontal, and a back edge 86 sloping downwardly from the top edge 84to the bottom edge 82 at an acute angle relative to the vertical. Eachside panel member 70 has tabs 90 extending downwardly from its bottomedge 82 and slots 92 (see FIG. 15) extending backwardly into its frontedge 80. Each side panel member 70 has rivet head-receiving pockets 94spaced along its bottom edge 82 and rivet head-receiving pockets 96spaced along its back edge 86. Each such pocket has a hole extendingdownwardly or backwardly therefrom.

As shown in FIGS. 9, 10, and 11, the front panel member 72 is generallyU-shaped with a planar portion 100, which is generally rectangular, twoside portions 102, which flare backwardly from the planar portion 100,and curved corner portions 104 between the side and planar portions. Theplanar portion 100 has a bottom edge 106 extending transversely. Eachside portion 102 has a back edge 108 extending vertically. The frontpanel member 72 has tabs 110 extending backwardly from the back edge 108of each side portion 102 and tabs 112 extending downwardly from thebottom edge 106 of the planar portion 100. The planar portion 100 hasrivet head-receiving pockets 114 spaced along the bottom edge 106. Eachpocket 114 has a hole extending downwardly therefrom. Also, near a topedge 116 of the front panel member 72, two pairs of rivet holes 118 areprovided.

As shown in FIGS. 3, 7, and 8, the bottom panel member 74 is generallyquadrilateral with a front edge 120 extending transversely, two sideedges 122 flaring backwardly and connected to the front edge 120 bycurved corner edges 124, and a back edge 126 extending transversely andparallel to the front edge 120. The bottom panel member 74 has a widestrip portion 128 extending transversely where the bottom panel member74 overlies the transverse portion 28 of the main frame 20 of thewheeled chassis 12. The bottom panel member 74 has slots 130 extendingdownwardly thereinto, near the front edge 120, and slots 132 extendingdownwardly thereinto, near each of the side edges 122. The bottom panelmember 74 has rivet holes 134 spaced along each side edge 122, rivetholes 136 spaced along the front edge 120, and rivet holes 138 spacedalong the wide strip portion 128.

As exemplified in FIGS. 19 and 21, each of the tabs 90, 110, 112, has agroove 140 defining a hooked end 142 with a chamfer 144, and each of theslots 92, 130, 132, is defined by a straight wall 146 and by anopposite, grooved wall having a groove 150 defining a hooked end 152with a chamfer 154. Thus, when the panel members are assembled, thehooked end 142 of each tab is interengaged with the hooked end 152 ofthe grooved wall of the slot receiving such tab.

Alternate ones of the tabs 90 extending from the bottom edge 82 of eachside panel member 70 are oriented so that the grooves 140 thereof faceoutwardly, whereas the other tabs 90 extending therefrom are oriented sothat the grooves 140 thereof face oppositely. As shown in FIGS. 7 and 8,the respective slots 132 near the side edges 122 of the bottom panelmember 74 are oriented so that the grooves 150 of the grooved wallsthereof face the grooves 140 of the respective tabs 90 received by suchslots 132.

Two outer tabs 112 extending from the bottom edge 106 of the planarportion 100 of the front panel member 72 are oriented so that thegrooves 140 thereof face outwardly, i.e. forwardly, whereas the othertabs 112 extending therefrom are oriented so that the grooves 140thereof face oppositely. The respective slots 130 near the front edge120 of the bottom panel member 74 are oriented so that the grooves 150of the grooved walls thereof face the grooves 140 of the respective tabs112 received by such slots 130.

As shown in FIGS. 4, 15 and other views, a portion along the top edge 84of each side panel member 70 has a wire-receiving formation 182, whichcomprises relatively short, outwardly opening channels 184 andrelatively long, inwardly opening channels 186. The inwardly openingchannels 184 alternate with the outwardly opening channels 186 along thetop edge portions 180 of the side panel members 70. Moreover, a portionalong the top edge 116 of the front panel member 72 has an outwardlyopening channel 192, which has a side portion 194 where the channel 192extends along each of the side portions 102 and a front portion 196where the channel 192 extends along the planar portion 100.

As shown in FIGS. 3, 13, 14, and other views, the basket 18 comprises arim wire 200, which is a length of steel wire bent so as to have twoside portions 202 and a bight portion 204 connecting the side portions202. After the plastic basket 18 has been assembled in a manner to belater described, the side portions 202 of the rim wire 200 extend alongthe side portions 194 of the channel 192 of the front panel member 72,and through the channels defining the wire-receiving formations 182 ofthe side panel members 70, and the bight portion 204 is received by thefront portion 196 of the channel 192 of the front panel member 72. Thus,the side portions 202 are received by the wire-receiving formations 182,and the bight portion 204 bears against the front panel member 72.

The shopping cart 10 is shown in various stages in its assembly in FIGS.12 through 22. The wheeled chassis 12 is preassembled in a known manner.

Initially, as shown in FIG. 12, the bottom panel member 74 is riveted tothe main frame 20 of the wheeled chassis 12 by rivets 210 (one shown)utilizing the back two holes 134 along each side edge 122 of the bottompanel member 74 and aligned holes 212 in the main frame 20 and by rivets214 (one shown) utilizing the rivet holes 138 along the wide stripportion 128 of the bottom panel member 74 and aligned holes 216 in themain frame 20. Moreover, as shown in FIG. 13, the rim wire 200 ismounted to the front panel member 72 so that the side portions 202 ofthe rim wire 200 are passed through the side portions 194 of theoutwardly opening channels 192 of the front panel member 72, until thebight portion 204 of the rim wire 200 enters the front portion 196 ofsuch channel. As shown on FIG. 14, two retaining clips 218 are used tosecure the rim wire to the front panel member 72, to which the retainingclips 218 are riveted via the rivet holes 118 near the top edge 116.

Thereupon, as shown in FIG. 15, the rim wire 200 is mounted to the sidepanel members 70 so that the side portions 202 of the rim wire 200 arepassed through the wire-receiving formations 182 comprised of thechannels 184, 186, at the top edge portion 180 of the side panel members70. Next, as shown in FIG. 18, the tabs 110 along the side portions 102of the front panel member 72 are snapped into the slots 92 along thefront edges 80 of the side panel members 70. Also, where extendedbackwardly from the wire-receiving formations 182, the ends of the sideportions 202 of the rim wire 200 are bent upwardly to form two prongs206.

Next, the side panel members 70 and the front panel member 72 aremounted to the bottom panel member 74 by snapping the tabs 90 along thebottom edges 82 of the side panel members 70 into the slots 132 alongthe side edges 122 of the bottom panel member 74, and by snapping thetabs 112 along the bottom edge 106 of the planar portion 100 of thefront panel member 72 into the slots 130 along the front edge 120 of thebottom panel member 74. Thereupon, the side panel members 70 and thefront panel member 72 are riveted to the bottom panel member 74 byrivets (not shown) utilizing the pockets 94 along the bottom edges 82 ofthe side panel members 70 and the remaining holes 134 along each sideedge 122 of the bottom panel member 74 and by rivets (not shown)utilizing the pockets 114 along the bottom edge 106 of the planarportion 100 of the front panel member 72 and the holes 136 along thefront edge 120 of the bottom panel member 74.

Thereupon, as shown in FIG. 22, the handle structure 14 is placed on thebasket 18 by inserting each of the two prongs 206 into an aperture 208in one of the handle uprights 50, and by pivoting the handle structure14 downwardly until the lower ends 54 of the handle uprights 50 meet themain frame 20 of the wheeled chassis 12. Next, the handle uprights areriveted to the side panel members 70 by rivets (not shown) using thepockets 96 along the back edges 86 of the side panel members 70. Also,the lower ends 54 of the handle uprights 50 are riveted to the mainframe 20.

Finally, as shown in FIGS. 23 and 24, the pivotable back 16 is attachedto the handle uprights 50. The pivotable back 16 comprises an upper,transverse wire 60, which has two ends of unequal lengths. The end 62 islonger than the end 64. The longer end 62 is inserted into an aperture66 in one of the handle uprights 50 with a transverse movement of thewire 60, as suggested in FIG. 24, so as to provide sufficient clearancefor the shorter end 64 to be then inserted into an aperture (not shown)in the other upright 50 with an opposite, transverse movement of thewire 60. Thereupon, the pivotable back 16 is centered between the handleuprights 50, and a split sleeve 68 is forced over the longer end 62 soas to prevent the ends 62, 64, from being removed accidentally from suchapertures of the handle upright 50.

As shown in FIG. 4, each side panel member 70 has a relatively small,generally rectangular recess 220 near its bottom and back edges. Therecess 220 has a planar wall 222, four rounded corners 224, a raised,cross-shaped, generally centered formation 226, and raised cornerformations 228. Each corner formation 228 has a hole 230 extendingthrough the side panel member 70. As shown in FIG. 1, the recess 220 isadapted to receive a generally rectangular nameplate N, which is securedto the side panel by conventional rivets 232 extending through the holes230. The generally centered formation 226 protects the nameplate Nagainst being dented easily. The nameplate N is useful to display thename of a retailer providing the shopping cart 10 to its customers fortheir use while shopping.

As shown in FIGS. 4, 5, and 6, each side panel member 70 has arelatively large, generally rectangular recess 240 near its top and backedges. The recess 240 has a planar wall 242, four rounded corners 244,and four peripheral walls 246. Also, the recess 240 has two elongateslots, namely a top slot 250 extending along a top edge of the recess240 and a bottom slot 252 extending along a bottom edge of the recess240. For each side panel member 70, a generally rectangular frame 260 isprovided, which is molded from a plastic material. A preferred materialfor the frame 260 is high density polyethylene, which can be resilientlyflexed. An alternative material therefor is polyurethane. The frame 260has four rounded corners 262 and four peripheral walls 264 and is shapedto fit snugly within the rounded corners 244 and the peripheral walls246 of the recess 240. Also, the frame 260 has four retaining walls 266,which extend inwardly from the peripheral walls 264. The frame 260 hastwo elongate tabs, namely a top tab 270 and a bottom tab 272. Becausethe frame 260 has a symmetrical shape, it is arbitrary to designate onesuch tab as the top tab 270 and the other tab 272 as the bottom tab.

When the frame 260 is fitted into the recess 240, as shown in FIG. 6,the frame 260 is flexed sufficiently to permit the top tab 270 to beinserted into the top slot 250 and the bottom tab 272 to be insertedinto the bottom slot 252. Thus, the frame 260 is adapted to retain anadvertising card C of a cardboard or plastic material, between theretaining walls 266 of the frame 260 and the planar wall 242 of therecess 240. The frame 260 can be easily removed and refitted so as topermit the advertising card C to be easily replaced.

As shown in FIG. 25, the planar portion 100 of the front panel member 72may be optionally provided with a similar recess 280, into which asimilar frame 282 may be similarly fitted to hold an advertising card Dof a cardboard or plastic material.

Various modifications may be made in the preferred embodiment describedabove without departing from the scope and spirit of this invention.

We claim:
 1. A shopping cart comprising a wheeled chassis, a handlestructure, and a basket fastened to the wheeled chassis and to thehandle structure, said basket comprising separate panel members moldedfrom a plastic material, said panel members including two side panelmembers, a front panel member, and a bottom panel member, certain of theside, front, and bottom panel members having spaced tabs thereon andcertain of the side, front, and bottom panel members having spaced slotstherein, the spacing between the tabs corresponding to the spacingbetween the slots and the tabs being received by the slots to rigidlyassemble and interlock the side panel members to the front panel memberand to the bottom panel member and to rigidly assemble and interlock thefront panel member to the bottom panel member, said handle structurehaving a pivotal back attached thereto providing a basket back member.2. The shopping cart of claim 1 wherein said tabs include tabs on sideedges of the front panel member and tabs on bottom edges of the sidepanel members, said slots including slots in the bottom panel memberreceiving the tabs on bottom edges of the side panel members and slotsin front edges of the side panel members receiving the tabs on sideedges of the front panel member.
 3. The shopping cart of claim 2 whereinsaid tabs include tabs on a bottom edge of the front panel member, saidslots including slots in the bottom panel member receiving the tabs onthe bottom edge of the front panel member.
 4. The shopping cart of claim3 wherein each of the side panel members is riveted to the bottom panelmember and to the handle structure.
 5. The shopping cart of claim 1wherein each side panel member has a top edge portion having awire-receiving formation extending along the top edge portion and thefront panel member has a top edge portion, said basket furthercomprising a rim wire having two side portions received by thewire-receiving formations, the rim wire having a bight portionconnecting the side portions and bearing against the top edge portion ofthe front panel member.
 6. The shopping cart of claim 5 wherein thewire-receiving formations comprise outwardly opening channels andinwardly opening channels, which alternate with the outwardly openingchannels along the top edge portions of the side panel members.
 7. Theshopping cart of claim 6 wherein the top edge portion of the front panelmember has an outwardly opening channel receiving the bight portion ofthe rim wire.
 8. The shopping cart of claim 6 wherein the handlestructure includes two handle uprights and wherein the side portions ofthe rim wire extend backwardly from the side panel members and are bentto define two prongs extending into apertures in the handle uprights andlimiting forward movement of the basket relative to the handlestructure.
 9. The shopping cart of claim 8 wherein each of the handleuprights has a tubular wall and wherein each of the prongs extends intoa single aperture in the tubular wall of one of the handle uprights.